php 在PHP中查找字符串中的最后一个字符
声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow
原文地址: http://stackoverflow.com/questions/4427172/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Find last character in a string in PHP
提问by Bob Cavezza
I'm doing some url rewriting in PHP and need to find URLS with a slash at the end and then do a 301 redirect. I thought there'd be a simple PHP function to find last string, but I couldn't find anything. First instincts make m think I need to use regex, but I'm not 100%.
我正在用 PHP 进行一些 url 重写,需要找到末尾带斜杠的 URL,然后进行 301 重定向。我以为会有一个简单的 PHP 函数来查找最后一个字符串,但我找不到任何东西。第一直觉让我觉得我需要使用正则表达式,但我不是 100%。
Here's one example:
下面是一个例子:
http://domainx.com/characters/I want to find a trailing slash and turn it into http://domainx.com/characters
http://domainx.com/characters/我想找到一个尾部斜杠并将其变成http://domainx.com/characters
So what function will help me check if the last character is a "/"?
那么什么函数可以帮助我检查最后一个字符是否是“/”?
回答by powtac
A nice solution to remove safely the last /
is to use
安全删除最后一个很好的解决方案/
是使用
$string = rtrim($string, '/');
rtrim()
removes all /
s on the right side of the string when there is one or more.
rtrim()
/
当有一个或多个时,删除字符串右侧的所有s。
You can also safely add exactly one single /
at the end of an URL:
您还可以安全地/
在 URL 末尾添加一个:
$string = rtrim($string, '/').'/';
回答by Gumbo
You can use substr
:
您可以使用substr
:
substr($str, -1)
This returns the last byte/character in a single-byte string. See also the multi-byte string variant mb_substr
.
这将返回单字节字符串中的最后一个字节/字符。另请参阅多字节字符串变体mb_substr
。
But if you just want to remove any trailing slashes, rtrim
is probably the best solution.
但如果您只想删除任何尾部斜杠,rtrim
这可能是最好的解决方案。
And since you're working with URLs, you might also take a look at parse_url
to parse URLs as a trailing slash does not need to be part of the URL path.
并且由于您正在处理 URL,因此您可能还会查看parse_url
解析 URL,因为尾部斜杠不需要是 URL 路径的一部分。
回答by rik
$string[strlen($string)-1]
gives you the last character.
$string[strlen($string)-1]
给你最后一个字符。
But if you want to strip trailing slashes, you can do $string = rtrim($string, '/');
. If there is no trailing slash, $string
will remain unchanged.
但是如果你想去掉尾部的斜杠,你可以做$string = rtrim($string, '/');
. 如果没有尾随斜线,$string
将保持不变。
回答by Sandeepan Nath
You can use basename()
您可以使用basename()
This will return characters
for http://domainx.com/characters/
as well as http://domainx.com/characters
这将返回characters
的http://domainx.com/characters/
还有http://domainx.com/characters
You can do like this:-
你可以这样做:-
$page = $_SERVER['REQUEST_URI'];
$module = basename($page);
Then you can use the $module
directly in your conditional logic without doing any redirects.
然后,您可以$module
直接在条件逻辑中使用 ,而无需进行任何重定向。
If you want to collect the last /
trimmed URL then you can do this:-
如果您想收集最后/
修剪的 URL,则可以执行以下操作:-
If you are storing the project base url in a config file:-
如果您将项目基本 url 存储在配置文件中:-
BASE_URL = 'http://example.com'
then you can do this:-
那么你可以这样做:-
$page = $_SERVER['REQUEST_URI'];
$module = basename($page);
$trimmedUrl = BASE_URL.'/'.$module;
回答by Biotox
You could preg_replace()
a /
at the end of the subject
你可以preg_replace()
一个/
拍摄对象的结束
$url = 'http://domainx.com/characters/';
$url = preg_replace('/(?:\/)$/', '', $url);
回答by nektobit
If you have php > 7.1
如果你有 php > 7.1
$string[-1]
Will give you the last character
会给你最后一个字符
http://sandbox.onlinephpfunctions.com/code/ff439889f14906749e4eb6328796c354c60f269b
http://sandbox.onlinephpfunctions.com/code/ff439889f14906749e4eb6328796c354c60f269b